RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v29]

[XenoAmess]

> 8281631: HashMap copy constructor and putAll can over-allocate table

XenoAmess has updated the pull request incrementally with one additional commit since the last revision:

  manually create reference for ensuring test for WeakHashMap when IntegerCache.high is configured/changed default value.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7431/files
  - new: https://git.openjdk.java.net/jdk/pull/7431/files/11a57a2d..3f1e0e7c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=28
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=27-28

  Stats: 18 lines in 1 file changed: 16 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7431.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7431/head:pull/7431

PR: https://git.openjdk.java.net/jdk/pull/7431